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首页> 外文期刊>RSC Advances >Activated biochar derived from pomelo peel as a high-capacity sorbent for removal of carbamazepine from aqueous solution
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Activated biochar derived from pomelo peel as a high-capacity sorbent for removal of carbamazepine from aqueous solution

机译：柚皮衍生的活性生物炭，用作从水溶液中去除卡马西平的高容量吸附剂

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In recent years, the application of biochar to remove contaminants from aqueous solutions has become interesting due to favorable physical/chemical properties and abundant feedstocks. Herein, activated biochar was prepared by carbonization and further KOH activation using pomelo peel as a precursor. A series of characterization methods indicated that activation temperature can significantly influence the pore structure and surface chemistry of the obtained activated biochar. When used as a sorbent, the results showed that the adsorption isotherms of carbamazepine (CBZ) onto these activated biochars could be described well by Langmuir models. In addition, the kinetics of CBZ adsorption onto activated biochars were fitted well by pseudo-second-order kinetics and controlled by the intra-particle diffusion. The pore structure and surface functional groups could affect the adsorption of CBZ, resulting in the activated biochar of AB-700 delivering a higher adsorption capacity of CBZ up to 286.5?mg g?1. Furthermore, different factors in the sorption process of CBZ on AB-700, such as temperature, pH, ionic strength and reusability, were studied in detail. The effects of solution temperature revealed that the adsorption processes were spontaneous and exothermic, and mainly physisorption. The presence of Na+ ions in solution showed almost no effect on the adsorption of CBZ. The reuse studies demonstrated that AB-700 showed 58.5% capacity retention at the 4th cycle for the adsorption of CBZ. The effect of solution pH and surface analysis of biochar indicated that the adsorption of CBZ onto the activated biochar was mainly controlled by π–π electron donor–acceptor interaction.
机译：近年来，由于有利的物理/化学性质和丰富的原料，应用生物炭从水溶液中去除污染物已变得令人关注。在本文中，通过碳化并使用柚皮作为前体进一步KOH活化来制备活化的生物炭。一系列表征方法表明，活化温度会显着影响所得活化生物炭的孔结构和表面化学性质。当用作吸附剂时，结果表明，卡马西平（CBZ）在这些活化生物炭上的吸附等温线可以用Langmuir模型很好地描述。此外，CBZ吸附到活化生物炭上的动力学通过拟二级动力学很好地拟合，并受颗粒内扩散控制。孔结构和表面官能团可能影响CBZ的吸附，导致AB-700的活化生物炭对CBZ的吸附能力高达286.5？mg g ？1 。此外，详细研究了CBZ在AB-700上的吸附过程中的不同因素，例如温度，pH，离子强度和可重复使用性。溶液温度的影响表明，吸附过程是自发的，放热的，主要是物理吸附。溶液中Na + 离子的存在对CBZ的吸附几乎没有影响。再利用研究表明，AB-700在第4 循环中吸附CBZ的容量保持率为58.5％。溶液pH值和生物炭表面分析的影响表明，CBZ在活化的生物炭上的吸附主要受π-π电子供体-受体相互作用的控制。

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